CN2854598Y

CN2854598Y - Sample injector of titration device

Info

Publication number: CN2854598Y
Application number: CN 200520077911
Authority: CN
Inventors: 王根忠
Original assignee: JIANGFEN ELECTRICAL ANALYZERS CO Ltd JIANGSU
Current assignee: JIANGFEN ELECTRICAL ANALYZERS CO Ltd JIANGSU
Priority date: 2005-11-24
Filing date: 2005-11-24
Publication date: 2007-01-03
Anticipated expiration: 2015-11-24

Abstract

A titration device sample introduction injector is a significant part of the electrochemistry analyzer instruments. A circular groove is arranged in the external circle in the front of the injector's glass tube, an O type rubber ring is arranged in the circular groove, and the connection sleeve and the locking cap connecting the educing tube is locked in the rubber ring; the end surface of the injector piston is a smooth curved surface 0.5-1.0mm exposed to the surrounded area. 2-4 convex rings are arranged in the side surface of the piston, and the curved ring and the inner wall of the glass pipe is associated. The utility model is in use for the titration to the standard solution in the titration test of electrochemistry analysis. The tight connection prevents from coming off and liquid leakage, thus being easy for maintenance. Meanwhile, when the piston is pushed in, the air bubble and leakage can be avoided and the motion resistance can be reduced, so the use effect is quite good.

Description

The titration apparatus sampling injector

Technical field

The utility model relates to a kind of sampling injector of electrochemical analysis titration apparatus, particularly titration apparatus.

Background technology

In the electrochemical analysis field, titrimetry is to use the standard solution titration detected solution, makes that two kinds of solution neutralize, precipitation, redox or complex reaction.When being titrated to terminal point, have special reaction, lead sudden change with solution temperature or the like as electrode potential, electricity.The consumption of titrant during according to the concentration of titrant and terminal point can be obtained the concentration of detected solution.Therefore, no matter be the titration of which kind of form, all titration apparatus to be arranged, all need a sampling injector simple and reliable, easy to maintenance.

Usually, sampling injector glass tube in the titration apparatus and delivery line adopt taper fit, in use produce leakage unavoidably, the interface locking cap adopts the form (seeing accompanying drawing 2) that is threaded, though avoided interface to come off, the problem of leakage, but also brought the difficulty of processing of glass tube big, the problem that manufacturing cost rises.Also have a kind of sample introduction glass tube to adopt end boss structure (seeing accompanying drawing 3), its drawback is to put the interface locking cap in advance, just can finish whole operation processing then, gives to produce and safeguards, repairs to change and bring very big inconvenience.Moreover glass tube is to process under hot conditions, unavoidably the interface locking cap of being made by plastic material is caused the temperature injury.In addition, the piston crown end face of existing sampling injector is the plane, easily produces bubble, and the whole face of cylinder of piston side contact with the glass tube inwall, and having cooperated tight can resistance, has cooperated meeting generation seepage loose.

The utility model content

The technical problems to be solved in the utility model provides a kind of handling ease, titration apparatus sampling injector that result of use is good, easy to maintenance.

The technical solution of the utility model is: the titration apparatus sampling injector, comprise glass tube, piston, delivery line and joint, adapter sleeve, pin cap, improvements are on the described glass tube front end periphery ring groove to be arranged, establish rubber ring in the ring groove, and this rubber ring is in locking cap between step surface and the adapter sleeve end face, described piston end surface is the smooth surface that the center is higher than periphery, and there are 2～4 road bulge loops the piston side, this bulge loop and glass tube inwall interference fit.

Further technical scheme is: described ring groove cross section is a U-shaped, establishes O type rubber ring in the groove; Described piston end surface culminating point is than the high 0.5～1.0mm of periphery; Described piston material is a teflon, and its side bulge loop and the glass tube inwall magnitude of interference are 0.04～0.08mm.

Adopt above technical scheme, on sample introduction glass tube front end periphery, be processed into the ring-type U-lag, earlier locking cap is pushed from the glass tube front end during assembling, again O type rubber ring is inserted in the U-lag, then adapter sleeve is screwed in locking cap, make rubber ring compress outer rising, the connecting portion leakage that can not get loose, this structure handling ease, mounting or dismounting are convenient, use reliable.The piston crown end face is the smooth surface that the center is higher than periphery, and practice shows that when the pushing titration solvent can avoid producing bubble, there is bulge loop the piston side, with the glass tube inwall certain magnitude of interference is arranged, and has both prevented seepage, reduces the resistance of motion again, improves result of use.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is existing sampling injector interface screw connection structure synoptic diagram;

Fig. 3 is existing sampling injector interface boss syndeton synoptic diagram;

Fig. 4 is the utility model piston structure synoptic diagram (amplification).

Embodiment

Referring to Fig. 1, Fig. 4, on the glass tube 6 front end peripheries ring groove is arranged in the utility model, establish O type rubber ring 4 in the groove, the interior step of locking cap 5 is pressed on the rubber ring, can not come off, locking cap 5, adapter sleeve 3, joint 2 are connected delivery line 1 jointly with the glass tube forward end seal; The end face of piston 7 is the smooth surface that the center is higher than periphery, difference in height Δ h=0.8mm, and piston is made by teflon, and there are 3 road bulge loops 8 side, and this bulge loop and the glass tube inwall magnitude of interference are 0.05mm.

Claims

1, a kind of titration apparatus sampling injector, comprise glass tube, piston, delivery line and joint, adapter sleeve, pin cap, it is characterized in that on the described glass tube front end periphery ring groove being arranged, establish rubber ring in the ring groove, and this rubber ring is in locking cap between step surface and the adapter sleeve end face, described piston end surface is the smooth surface that the center is higher than periphery, and there are 2～4 road bulge loops the piston side, this bulge loop and glass tube inwall interference fit.

2, by the described titration apparatus sampling injector of claim 1, it is characterized in that described ring groove cross section is a U-shaped, establish O type rubber ring in the groove.

3,, it is characterized in that described piston end surface culminating point is than the high 0.5～1.0mm of periphery by the described titration apparatus sampling injector of claim 1.

4, by the described titration apparatus sampling injector of claim 1, it is characterized in that described piston material is a teflon, its side bulge loop and the glass tube inwall magnitude of interference are 0.04～0.08mm.